The lightsaber stance, he's kinda holding it behind him, so it looks like he doesn't even give a **** about blaster fire, maybe it is because he is The Apprentice
so he can already see in advance whether blaster shots hit him or not, so that's why he isn't concerned at all.
I think I read somewhere on the official site that Starkiller is not fully skilled with a lightsaber. His true power lies with his force abilities. Perhaps part of the lightsaber stance is to de-emphasize it's importance in comparison to the force powers in the game.